Alec Baldwin has reprised in his role as Donald Trump for the latest episode of Saturday Night Live’s Weekend Update, identifying the US president as the true martyr of the tragic Charlottesville rally.

A 12-year-old singing ventriloquist has been awarded US$1 (A$1.3) million prize and her own Las Vegas show after taking the America's Got Talent crown on the season 12 finale of the NBC reality competition.

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Thousands of wealthy Republicans, who have staunchly coughed up cash in the last two elections, have not donated to Trump’s campaign, USA Today reports.

Hillary Clinton has more than $42 million in her campaign war chest, compared to Trump's $1.3 million. (AAP)

Republican strategist Scott Smith, who worked on presidential bids for Jeb Bush and former Texas Governor Rick Perry, said he was not alone in refusing to work for Trump.

"Even if I wanted to work for Trump, my wife would kill me," he said.

The true financial strength of Trump and his ability to continue to self-fund his campaign, as he has largely done so far, is shrouded in mystery.

Trump has so far resisted calls to declare his earnings and release his past tax returns, saying they are “no one else’s business”.

A Republican strategist has said if he worked with Trump "his wife would kill him". (Getty)

Charles Spies, a veteran Republican lawyer who helped organise campaigns for Jeb Bush and Mitt Romney, said Trump had committed “fundraising malpractice” and “lost a month he could not afford to lose” by not securing more fundraising.

Trump’s financial worries have been compounded after he faced a widespread outcry after he accused a federal judge of bias because of his Mexican heritage. The judge is presiding over cases involving Trump's defunct online university.

And in the aftermath of the mass shooting at a gay nightclub in Orlando, the brash businessman tweeted his thanks to people who congratulated him for "being right on radical Islamic terrorism."

"I think there's no question that he's made a number of mistakes over the last few weeks," Republican Mitch McConnell, the Senate majority leader, told ABC News on Sunday.

"I think they're beginning to right the ship. It's a long time until November. And the burden, obviously, will be on him to convince people that he can handle this job."

According to the Washington Post-ABC News poll, two in three Americans say Trump is unqualified to lead the nation.

However, survey respondents also indicated unease with former secretary of state Clinton, although the Wall Street Journal/NBC News poll showed 78 percent of Bernie Sanders primary supporters backed her.

Speculation continued to swirl Sunday about who will be the running mates of the two presumptive nominees.

Former Republican House Speaker Newt Gingrich, whose decades of political experience would be a counterbalance to Trump, has been repeatedly mentioned as a potential vice presidential candidate but said Sunday he has not been contacted about the position.

He said he thinks Trump will make a last-minute decision even though the start of the Republican National Convention in Cleveland is just over three weeks away.

"He's probably going to start thinking about it two days before Cleveland," Gingrich said on Fox News Sunday.

"I think Donald Trump does not want to make a decision until the convention. I think that he is a very decisive person."